Burglar-alarm system and apparatus therefor.



. T. H-'. NELSON. BURGLAR ALARM SYSTEM AND APPARATUS THEREFOR.

APPLICATION FlLED JAN.29-. me.

1,290,644. I Patented Jan. 7,1919. 3 SHEETS-SHEET l1 re WSO Q wag T. H.NELSON.- v 'BURGLAR ALARM SYSTEM AND APPARATUS THERE'FOR.

ARPLICATMN FILED M29. 1916; 1,290,644.

s SHEETS-SHEET 2.

aw/hier- JZeodare%%d507M ,Pafehfed-Jan. 7, 1919.

T. H. NELSON. BUR GLAR ALARM SYSTEM AND APPARATUS THEREFOR.

APPLICATION FILED JAN-29. 1916 Patented-Jan. 7,1919.

THEODORE H. NELSON, or CHICAGO, rumors.

. BURGIiAR-ALARM sYsrEM AND APPARATUS THEREFOR.

To all whom it may concern." I

Be'it known that I, THEODORE H. NELSON,

a citizen of the United States, residingat Chicago, in the county ofCook and State of Illinois, have invented a new and ImprovedBurglar-Alarm System and Apparatus Therefor', of which the following isa specification.

My invention relates to an improved burglar alarm system designedparticularly to protect an outer doorway which must be used to secureaccess to the system, and it is an object'of my invention to providecircuit connections and controlling mechanisms so that byproperoperation of the controlling mechanism by an authorized person thesystem is temporarily disabled so'that the door may be opened 'withoutringing the alarm. It is a further object of my invention toautomatically return the signaling system to its, set condition by thesubsequent closing of the door. While my system is applicable to burglaralarms it is also applicable to other-purposes in which it is desired tocontrol an electric circuit so that bythe operation of the controllingmechanism in a predetermined manner the circuit is maintained in onecondition; whereas the improper manipulation ofthe controlling mechanismleaves the circuit in anothercondition. Thus, for example, in a burglaralarm system the alarm circuit may be normally open and the properoperation of my controlling mechanism maintains said circuit in its opencondition notwithstanding the operation of the alarm contacts, or theburglar alarm system may have a normally closed circuit which ismaintained in its closed condition by the proper operation of mycontrolling mechanism when the alarm contacts are actuated subsequent tosaid operation of the controlling mechanism. Or-

again, other circuits may be similarly con-- trolled, such, for example,as the ignition circuit of an automobile so that the ignition c1rcuitremains open even though the usual key switch'be closed until thecontrolling mechanism characterizing my invention is actuated in therequired manner.

The several drawings illustrating my invention are as follows:

Figure 1 is a diagrammatic drawing showing my system applied to an opencircuit burglar alarm system,

.Fig. 2 shows in a new similar to 1 Specification of Letters Patent.

- Application filed January 29, 1916. Serial 110. 751,962..

Patented J an. '7, 1919.

the-application of my system to a closed circuit burglar alarm system,

Fig. 3 shows in a view similar to Figs. 1 and 2 the application of mysystem. to the ignition circuit'of an automobile,

Fig. 4 shows in a vertical sectional view the detail construction of thecontrolling mechanlsm,

Fig. 5 shows the controlling mechanism in I front elevation,

Fig. 6 shows the controlling mechanism in rear elevation with the casingremoved, and Fig. 7 shows the controlling mechanism in :front elevationwith the front plate removed.

Similar numerals refer to similar parts throughout the several views;

Since the operation of my system depends in large part upon thecontrolling mechanism employed, I will first describe this mechanismreferring particularly to Figs. 4, 5, 6 and 7. In these figures thecasing 10,- which is cylindrical in form, is secured by screws asindicated to the front plate 11 which supports by a plurality of posts.12

the insulating disk 13 which constitutes the support for the contacts14: and conducting ringl5, these contacts and conducting ring beinglocated on the front side of the disk. The front plate 11 has extendingrearwardly from it a centralboss 16 in which a cylindrical rod 17 ismounted so as to be freely rotatable. The inner end of therod 17 hasmountedupon it a contact blade 18 which is secured in place between acollar 19 and nut 20 carried by said rod. One end of the contact blade18 is arranged to engage the contact ring 15 and the otherend of saidblade is arranged to engage desired ones of the contacts 14, theconducting ring and contacts being in different planes sothat thecontact engaging end of the contact blade does not engage the conductingring. In

- formed therefor in the front. plate 11. The

flange 24 has projecting rearwardly from it a' pin 25 for entering theholes 26 formed in the front plate to permit the dial to be as a resultof the cocperation of the pin 25 with the corresponding one of the holes26,

' to the rear to close the circuit controlled the selected contact.

the dial may be pushed rearwardly against the action of the spring21tobring the contact bladef18. into engagement w1th the selected contact14' and at the same time with the conducting ring 15'w'hich serves'toelectrically connect the .selected contact with said conductingring. Thepin 25serves to prevent holding the dial 22 in its rearward position andsWeeping'the contact blade over the contacts one after the other andnecessitates angular adjustment of the dial to a desired position beforethe dial can be moved Since the controlling mechanism described is ofnecessity. located on the outside of the room or building protected by.the alarm system and therefore accessible to any one who desires tooperate it, I provide against tam- 'pering with the system by the-removal of the front plate in an attempt to disable the system byproviding the safety springs 27 and 28 on the r'earfaceof the disk 13,which springs in an open circuit system are nor- I mally separated fromeach other by the en-.

gagement ofan insulating plug 29' carried r I glar alarm. The contact 58of the burglar by the spring 28 with the inner wall of the casing 10 sothat when' the front plate 11 and the parts carried thereby are removedfrom the casing the springs 27 and 28 come together, closing the desiredcircuit, in a manner to 'be explained. Similarly for .a

closed circuit control system the safety springs are normallyheld incontact with each other as indicated in Fig. 2, and for thisconstruction when the front plate isremoved the contact springs27 and28* separate from each other opening the controlled circuit and givingthe alarm.

In Fig. 1.1 have shown an application of my controlling mechanism to an0 en circuit burglar alarm system, the controlling mechanism alreadydescribed being provided with relay mechanism for controlling the alarmcircuit, which relay mechanism forms a part ofthe control system whetherused for an 50 open'circult or a closed circuit burglar alarm,

or Whether used for any other circuit control. In this figure the wire30 is connected with a desired one of the contacts 14 and also to oneterminal of the winding of the relay 31, the other terminal of which iscon nected with the negative terminal of battery other terminal of whichis connected with the negative terminal of battery 40, the otherterminal of which battery is connected with the common conductor 33. Thewire 38 is also connected with the armature 41 of the relay '39, andwire 42 is connected with another desired one of the contacts 14 andwith a second armature 43 of the relay '39; which armaturec'ooperateswith a make-contact. 44 connected by'wire 45mm an armature-46 of relay47, which relay is constructed so as to be sluggish, in operation for apurpose to be described. .The wire 45 is also connected with abreak-contact 48 of the armature 49 of relay 50. The armature 49 isconnected with one terminal of the winding of the relay 47, the otherterminal of which is connected with the'negative terminal of bat tery51, the other terminal of said battery being connected-with the commonconductor 33. The negative terminal of the battery 51 is also connectedwith a-second armature 52 of relay 47, which is provided with'amakecontact 53'connected by wire 54 with a second armature 55 oftherelay 50. The wire 54 is also connected withone terminal of the windingof the relay 50, the other terminal of'said winding being connected b'wire 56 with-one of the door contacts 57 o the burengagement with thecontact 60 serving to 4 move the contact 60 away from the contact 61with which it is normally in engagement. The-contact 61 is connected bywire 62 with make-contacts 63'. and 64 of armatures 34 and 41respectively. The contact 60 is connected by wire 62% with the contactof armature r .of relay Rand the armature r. is connected by-wire 88with the common conductor 33. with a make-contact '65 connected with thenegative terminalof battery 66, the other terminal of which is connectedwiththe com- 'mon conductor 33. ,A release wire 67 is connected w1th oneor more-of the contacts 14 The armature 55 is provided as desiredandalso to one terminal of the winding of relay R, the other terminal of;

said winding being connected'to the negat1ve terminal of the battery B;the-other with one terminal.v of the battery 76 and one terminal of thebell 77 respectively, the other terminals of the battery and bell'beingconnected-together, as a result of which when the drop 1s actuated thebell circuit is closed and itcontinues to ring an alarm until the dropis restored to its normal position shown in Fig. 1. with abreak-contact78 connected by wire 79 with a third armature 80 of; relay 50.

The armature 80 is provided with a breakcontact 81 connected by wire 82withfone of the contact springs 83 of the door mechanism, thecooperating spring 84 being connected with wire 56. The door has securedto it a plate 85 carrying a plug 86 which engages the spring 58 when thedoor is closed and separates said spring from the spring 57. Aconducting plug 87 separate and insulated from the plate 85 is providedfor engaging the springs 83 and 84 when the door is in its closedposition, this plug being suitably mounted on the door casing so that itmay occupy an outer position away from the springs 83 and 84 when thedoor is open and thus prevent ,closin the alarm circuit by the springs57 an 58. Closing the door serves to move the plug 87 between thecontacts 83- and 84, .thus' conmeeting them so that-a subsequent openingThe armature 68 is provided of the door closes the alarm circuit by theengagement of the springs 57 and 58 since the plug 87 remains betweenand in contact with the springs 83 and 84 and thus electrically connectsthem. The door contact, springs and the operating mechanism describedconstitute a part of the subject matter of my Patent Number 1,127,916,issued February 9, 1915, and therefore requireno further illustration ordescription. The wire 69 may be extended if desired to the controllingmechanism and connected with an otherwise disconnected one of thecontacts14 so that an unauthorized person tam pering with thecontrolling mechanism and pressing the dial rearwardly in a positioncorresponding to the contact with which the Wire 69 is connected willoperate the alarm.

As a result of the connections described and assuming that the wires 30,35 and 42 are connected respectively with the contacts 14 which arenumbered 2, 5 and 7 on the dial plate and that the wires 69 and 67 areconnected with the contacts 14 designated 9 and 3, 6 and 8 respectivelyon the dial plate, the operation of the system is as follows: The.relays 31, 39, 47, 50 and R are normally denergize'd, as a result ofwhich if the plug 86is removed from the contact'spring 58 a circuit isclosed through the winding of the drop -71 as followszbattery 72,winding 71, wire 69, switch 70, armature "68, contact 78, wire 79,armature 80, contact 81, wire 82, contact spring 83, plug 87,-contactspring 84, spring 57, sprlng' 58, wire 59, wire 73 back to battery 72.This closes the bell cir-- I cuit and the alarm is sounded. To temposrarily disable the alarm circuit so that closure of thesprings 57 and 58will not operatethe alarm circuit just traced, a person desiring toenter the door first rotates the dial to the indication 2 and presses itrearwardly, which connects the conducting ring with the contact marked2. As a result of this, since the common conductor 33 is connected withthe contact numbered 14 and in turn with the conducting ring 15,

a circuit is closed as" follows: battery 32,

wire 33, contact marked 14, conducting ring 15, contact blade ofcontrolling mechanism,

contact marked 2, Wire 30, winding of relay 31, .back to battery 32. Asa result the armatures 34 and 36 are attracted and the relay 31ismaintained in energized condition through the following lockingcircuit: battery' 32, wire 33,- wire 88, armature 1, wire 62', contact.60, contact 61, wire 62, contact 63, armature 34, winding of relay-31,back to battery 32. After depressing the dial in the position marked 2with the results described, which of course occur as soon as the circuitis closed, the dial ispermitted to move to. its outer position and isrotated to the position marked 5, and again pushed armatures 41 and 43are attracted and a locking circuit for the relay 39 is closed asfollows gbatter'y 40, wire 33, wire 88, armature 7", wire 62, contact60, contact 61, wire 1 62, contact 64, armature 41, winding of'relay 39back to battery 40. The operator now v releases the dial and rotates'itto the position marked 7, and again press'es'the dial rearwardly, whichconnects the contact marked 7 with the'conducting ring 15, and thuselectrically connects wires. 33 and 42 and closes the following circuit:battery 51, wire 33, wire 42, armature 43, contact 44, wire-45, contact48, armature 49, winding of relay 47 back to battery 51.- As a resultthe armature 46 is attracted and closes a locking circuit for the relay47 before separating the contact 60 and 61, this locking circuitbeing-as follows: batter 51, wire 33,-

wire 88, armature 1', wire 62, contact 60,

armature 46, wire 45, contact 48, armature 49, winding of relay 47, backto battery 51.

The separation of the contacts 60 and 61 opens the locking circuitsabove traced for the relays 31 and 39 as a result of which it willappear that the relay 47 is locked in energized condition beforethe-relays 31 and 39 are released by the opening of their lockingcircuits. Besides closing a locking circult for itself the energizationof the relay -47connects the battery 51 with the winding of the relay sothat' said relay may. later be energized, and by attractin the armature68 the energization of .t e 'relayf-47 opens the alarm circuit abovetraced through the ,windingof the drop 71 and thus provents-"theenergization of the drop as long as the relay 47 is ener 'zed. For thiscon-- dition of the relay 4 the door may be opened without danger ofclosing the alarm same he has access to theswitch by which he may cutoff the alarm circuit before again opening the door and when he desiresto leave, the' conducting plu 87 is withdrawn, the cut-off switch 70 lscosed. and the door is shut with the result that the alarm circuit is not"closed by this operationfor the reason that the sp'rm'g 58 is removedfrom I engagement with the spring57 slightly in advance of theengagement of the contacts 83 and 84 by the plug 87. The connection ofthe release wire 67 with desired ones of the contacts 14 results inenergization of the relay R if the dial isdepressed in either of thepositions marked 3, 6 and 8 for the connectlons indicated in Fi 1, sinceif the dial is depressed. in either 0 these positions the wires 33 and67 are electricallyconnected 1n the controlling mechanism. This ener-'giz'ation circuit 1s as follows battery B, wire33 through thecontrolling mechanism 'to,wi re'67, winding ofirelay R back tobatcircuit and when so opened the removal'of the plug 86 from thecontact spring 58 closes the following circuit :bat-tery 51, wire 33,wire 59, spring 58, spring 57, wire 5,6,

. winding of relay 50, wire 54, contact'53,

armature 52,.back to battery 51. The energization of the relay 50attracts'thegarmatery B. As a result of the energization of r away fromits contact t e locking circuit the relay and the movin of the armaturethrough the'relays' 31 and39 is opened and these-relays are restored totheir normal rendition, and if for this condition the switch. of thecontrolling mechanism is ture 49 and thus opens the locking circuit.above,;traced1for the relay 47, but since the .relay 47 isof the slowacting type, the armature 52' doesnot leaYe the contact 53.11ntil afterlthe armature 55 of the relay 50 has been. brought into engagement withthe contact 65 to'furnish a retainlng circuit for the moved intoposition to connect the wires 33 and 42 the relay 47, will not beenergized smce'the armature 43 is awa firom its con- I relay 50 asfollows; battery .66, wire 33, wire 59,, contact 58, contact 57,wire'56, winding of relay 50, armature 55, contact 65, back to battery66; The relay 50 is thus maintalnedfin energized condition as long asthe springs 57 land 58 remain in engagement with, each other, or inother words, as long as the dooris 0 on, and for this condition thearmature 8O lsattracted away from the contact 81, this operation havingtaken place before the armature 68 returned into engage-' I I ment withthe contact 78 and thus the ener- 50 isenergizedw When the door isclosed 1 the springs 57 and 58 are separated, thus gizing circuit .ofthe drop 71is maintained 1n inoperative conditlon aslong as the relaytact. Similarly if prior to t e energization' of the relay R the relays31 39 and 47 have been energized and thus the relay 47 has been lockedin its actuated position the energiz'ation of the relay IRv opens thelocking circuit of .therelay 47, restoring it'to its;

normal condition. It therefore follows that whether one, two or all ofthe relays 31, 39

and 47. have been energized prior to'the' en-' .erglza'tion of the relayR, this operation of the relay R. restores or releases such of the'relays'31, 39 and 47 as may have, been energized' and' held in lockedcondition. The

safety springs 27 and 28 are connected rejspectively by wires 89 and 90with Wires 33 and 69, asa result-of which if it be attempted to removethe 'controllin mechanism from its casing 10 a circuit 13 closed'opening the locking circuit of therelay 50,

which thereupon returns to its normal condition and the controlhngsystem is again ready for operation.- A means is thusfprovided foropening the door without-actuating the a arm, provided the controlling.mechanism is properly manipulated whic I 60 can only be done, by anauthorized person who knows the combination,- the effect being the sameas though the'operation of a combination lock were required to open thedoor 1 without actuating'the alarm. When a person passes through thedoorand closes the through the drop 71 as above described for o eration ofthe controlling mechanism in t e. position marked 9. and the alarm issounded. While I have shown but two relays 31 and 39 which must beoperated in sequence before it is possible to operate the relay 47, itwill be understood that a greater number of such relays may be employedif controlled in Fig. 1 by the derstood that the entire system may beoperated from one battery if desired, such an arrangement being shown inthe modified system shown in Fig. 2, which is similar to the systemshown in Fig. 1, with the exception that the alarm circuit is normallyclosed instead of being normally open. In this modified construction therelays 31, 39, 47, 50 and R are similarly constructedand operatedthrough wires 30, 35, 42 and 67 from the controlling mechanism, theprincipal difference being that a single battery 91 is employed, to oneterminal of which the common conductor 33 'is connected and to theother'terminal of which acommon conductor 92 is connected, which in turnis connected by wires 93, 94, 95, 96 and 96 with the windings of therelays 31, 39, 47,

contact 65 and winding of relay R respectively instead of thesimilarlyconnected bat terie's 32, 40, 51, 66 and B as shown in Fig.-

1. In this modification the bell 77 has one terminal connected by wire97 with the common conductor 33 and the ,contact7 5 is connected by'wire 98 with the other common conductor 92, the shutter 74 of the dropbe ing connected with the other terminal of the bell 77.

In'this modification the alarm circuit is different from that abovedescribed in that it is normally closed and 'must be broken in order tooperate the alarm. This alarmi circuit maybe traced as follows: battery91, wire 92, wire 93, safety spring 28, safety spring 27, wire 94' towinding of drop 71,

cutoff switch 70, wire 95, wire 96,'contact spring 57, contact spring58, .wire 97, wire 98, wire 33 back to battery 91. The contact 84 isconnected with the contact 57 and the contact 83 is connected with thecontact -58" through wlre 97. In this. modification the, plug 87 is ofinsulating material and normallyprevents contact between the springs 83and when the door' is closed, for which position of the door the plug 86maintains the spring 58 in engagement with the spring 57. When plug 87 ais withdrawn the springs 83*? and 84 engage each. other, thusmaintaining the drop energized so that the removal of the plug 86 fromthe spring 58 w1l l not operate the alarm. The cutoff swltch is providedwith analternate contact 99 connected by wire 100 with wire 33,

the contacts of this switchbeing close enough together so that oneismade beforethe other is broken in the operation of the switch in orderthat the circuit through the energiz ing winding of the drop 71 mayremain closed while the switch is being moved from one position to theother. In this modification the armatures 68 and 80 of the relays 47 and50 respectively cotiperate with makecontacts 78- and 81 connectedtogether and 1 by wire 101 with common conductor 33, the

armatures 68* and 80 being connected to w1re 96. As a result of thecircuit connections described the energization of either the relay 47 or50, by attracting the armature 68 a or 80, as the case may be, maintalnsthe alarm circuit in closed condition, or in other words prevents-theoperation of the alarm which is the same result as is described for thesystem shown in Fig. 1 for the energization of the relays 47 and 50. Theseparation of the safety springs 27 and 28 from each other in themodified construction shown in i Fig. 2 opens the alarm circuit, thusringing the alarm so that for this modification pro tection maybesecured against tampering.

with the control mechanism in substantially the same manner as describedabove for the system shown in Fig, 1.

In the modified system shown in Fig. 3 my controlling mechanism isadapted to control the ignition circuit of. an automobile showndiagrammatically in this figure of drawings. In this modification thesecondary winding 105 of the-induction coil 106- has one of itsterminals connected by Wire 107 with the distributing switch 108 thecontacts 109 of which are connected by wires 110 with the spark plugs111 of the several cylinders of the engine, the casing 112 of which isconnected by wire 113 with the other terminal ofthe secondary ,windin105. The primary winding 114 of the 1n uction coil 106 has one of itsterminals connected with the vibrator 115, the other terminal of theprimary winding being connected by wire 116 with the contact 117 of thecontrol switch 118. The contact 119 of the vibrator mechanism isconnected by Wire 120 through switch 121 with one terminal of thebattery 122, the other terminal of which battery is connected by wire123 with the switch 118. The switch 121 may be of any desired kind andpreferably represents a key operated switch well known in the art,

-which provides'that the switch may only be cally controlled by mycontrol mechanism.

This control mechanism as herein employed consists of the relays 31 and39 operated by thecontrol mechanism 124 in precisely the mannerdescribed above for the relays 31 and 39. Battery current is suppliedfor the operation of the relays 31 and 39 through the common conductors92 and 33 from the battery 122 .in the same manner that current issupplied to the relays 31 and 39 from the battery 91 in Fig. 2. Theswitch 118 is pivotally mounted at 125 and 1s provided 'with a slot 126through "which a pin 127 projects, said pin being carried bya rod 128constituting the core of the solenoids 129 v and 130. The terminals ofthe-winding of the solenoid 129 are connected by wires 131 and 132 withthe common conductor 92 and the contact 44 of the armature 43 respec- 1tively. The terminals of the winding o'f the 'so1enoid'13O are connectedby'wire's'133 and 134mm a desired one of the contactsof the controllingmechanism 124 and with the common conductor 92? respectively. The

contacts 63 and 64?. cooperating with the armatures 34? and 41 areconnected together by wire 62 and to the vcontact 135, which is inengagement with thecontact spring 136 when the ignition circuit is openat the switch 118. The contact136 is connected by wire 137 with theswitch pivot 125. The contact spring 136 tends at all times to move fromengagement with, the contact spring 135 and when these contact springsare in engagement with each other they are held in such position by apin 138 engaging the contact spring 136, said pin being carried by therod 128. .The rodf128 is supported so as to move freely in the solenoids129 and 130 by suitable non-magnetic guides 139 and 140, the solenoids,the switch 118 and the 140 is scour 1n casing through which {wall anaperture is ormed in line with the rod 128, said a rcontact springs. 135and 136 being. suitably mounted in' a closed: box inaccessible except toone havi 1 a key to said box. The ide :5 to, one wall [141 of theinclost'ure bein somewhatjsmalIer-Ithan the ore it or the'gulde 140'and'through thisaperture a I plug 142. ,projects having I an; 1 operatinghead on its'outer end and an enlarged head 40' p the solenoid/129. Theswitch 118 is pref-' on its inner end- .for retaining it in lace ine'rablyrovided with a retaining spring 143 i {,of the construction forhol ing itin itso en osition. Asaresult d esc'nbed after-the relays 31"and 39Ihavebeen operated in the manner. describednabov'e for-Figs. land2 and the third-operating impulse is sent by thecontrolling'mechanismthrough wire 42 the solenoid 129. is energizedthrough the .'followingcircuit battery 122,. wire 92, wire 131, winding of solenoid; 129, wire132, contact 44 armature'43 wire 42 through the controlling mechanism124 to wire 33" and thus back to battery 122. This moyes the rod 128 tothe right, thus moving the switch 118 in engagement with the contact 117and closing the ignition circuit through the pri mary winding 114 ofthe'induction coil assuming that the key-operated switch 121 has beenreviously closed. The movement of the1'rod 128 to the right as shown inFig. 3' also permits the contact spring 1136- to move from engagementwith the contact 135,

.thus opening the locking circuit of the relays 31 and 39Theconstructio'n of the parts however, is such that the locking circuitis not opened until the-switch 118 is a spring 1.26

ing with the contact to which the wire 133 is connected and then pushingthe dial to the rear as above described: battery 122, wire 92, wire 134,winding of'solenoid' 130, wire 133 through the'controlling mechanism 124to wire 33 and thus back to battery 122. This serves to move the bar 128to the l'eftas a result of which the'switch 118 is moved from engagementwith its contact 117, and the ignition circuit is opened in whichposition; the switch and rod 128 are held by the spring 143. This sameopera- 1 .tion moves the pin. 138 into' engagement with the contactspring 136, thus moving said spring into engagement with the contact135, closing the locking circuitabove referred to forthe 'relays31"and.39". If

' referred the rod 128-may be moved to the eft to open the ignitioncircuit by means of the plug 142 without the use of the' 'controllingmehanism '124.

p As a result of'the construction above -de-- scribed itwillbelob'served that bylmy invention I have provided controlling mecha-'nism' such that .a. plurality. of-deyices' must be operated in apredetermined sequencein order that a desired electric circuit maybeopened or closed as desiredby the operation of the controlling. systemas awhol, and

furthermore that the switchin mechanism forminga' part of my controlli Imechanism affords a means for a plurality of positions, indicatednumerically or otherwise, to which the switching mechanism must be movedin the predetermined sequence to properlyopcrate theelectrical part ofthe controlling dialmay either have numerals or letters or any otherindicating characters-to guide in mechanism; It will be understood that;theselecting difi'er'ent conditions for operating. the controllingmechanism, and that these indicating characters may be placed in any Imanner upon or around the dial. thatwill aflord a guide to locating thedial definitely in difi'erent angular positions. Fromthe above it willappear thatthe' controlling mechanismof my system may be called acombination control, for the reason that from a plurality of possiblepositions of the con-- trolling mechanism by which the operation of thesystem is initiated certain positions must be selected in predeterminedorder to properly secure the successive operations of operation may bechanged as desired to meet varying conditions so that no two systermsmay have the same combination. v

It will be understood in connection with the systems shown in Figs. 1and 2 that the release wire 67 and therelay operated thereby may beomitted if desired as may also the ringing wire 69 and that otherarrangements of controlling relays may be employed as long as itisnecessary to operate the controlling relays in predetermined order orrelation to each other so that the circuit controlled by the system maybe opened or closed as desired by the subsequent operation of anotherrelay or electromagnetic device.

It will be understood that I do not limit myself in carrying out myinvention to the particular embodiments above described as I may employequivalents thereof without departing-from the spirit of my invention.

What I claim is: 1. A control system of the type described comprising incombination, an alarm circuit,

a plurality of electromagnetic devices, op-' operated to control theclosure of said circ'uit only when said switching mechanism is movedsuccessively to the several positions controlling I said devices intheir predetermined sequence of operation and electric del vicescontrolled by said alarm circuit for giving an alarm.

2. A control system of the type described comprising in combination, analarm circuit, a plurality of electromagnetic devices, operatingcircuits for said devices each controlled by the operation of apreceding one of said devices in the sequence of operation of saiddevices, contacts operated by the last one of said devices in saidsequence of operation .for controlling the closure of said alarmclrcuit, a switching mechanism having a plurality of operativepositions, one.

for operating each of said devices and other inoperative positions,whereby said devices are operated to control the closure of said circuitonly when said switching mechanism 18 moved successively to the severalpositions controlling said devices in their predetermined sequence ofoperation, said switching mechanism comprising a circular dial, a

switch blade and contacts for engagement with said switch blade, saiddial being movable in. one direction to select a desired con-. tact andin another direction to bring said contact blade into engagement withthe selected contact and electric devices controlled by said alarmcircuit forgiving an alarm.

3. A control system of the type described comprising in combination, analarm circuit, a plurality of relays each controlling the operatingcircuit of another in a predetermined sequence, contacts carried by thelast relay in said sequencefor controlling the closure of said alarmcircuit, switching mechanism having contacts and operating circuitsextending each from a desired one of said contacts to operate saidrelays, there being a greater number of said contacts than operatingcircuits whereby said switching mechanism must be selectively operatedin predetermined sequence to select the contacts connected with saidoperating circuits to properly operate said relays in the necessary.

sequence to control the closure of the desired circuit and electricdevices controlled by said alarm circuit for giving an alarm.

4. -A control system of the type described comprising in combination, analarm circuit,

a plurality of relays each controlling the operating circuit of anotherin a predetermined sequence, contacts carried by the last relayin saidsequence for controlling the closure of said alarm circuit, switchingmechanism having contacts and operating circuits extending each from adesired one of said contacts to operate said relays, there being agreater number of said contacts than operating circuits whereby saidswitching mechanism mustbe selectively operated in predeterminedsequence,to select the contacts connected with said operating circuitsto" properly operate said relays in the necessary sequence to controlthe closure of the desired circuit, said switching mechanismCOIIIPIfISIDg a rotary disk having a switch blade for engagement withsaid contacts and indicating characters for determining differentangular positions of said disk and switch blade corresponding to the;several contacts, said disk bein movable axially to bring said switchbla e into engagement with a selected contact and electric devicescontrolled by said alarm circuit for giving erative; positions, wherebysaid devices are operated to control ,the'closure of said circuit onlywhen said switching mechanism is giving an alarm.

' 4 mined sequence of operation, a. release circuit extending from saidswitchingmecha- "nism for restoring said electromagnetic devices tonormal condition and-electric devices controlled by said alarm circuitfor '6. A control system of the type described com rising incombination,an alarm circuit,

" a p urality of relays each controlling the operating circuit ofanother in a predetermined sequence, contacts carried by the last relayin said sequence for controlling the closure of said alarm circuit,switching mechanism having contacts and operating circuits extendingeach from a deslred one of said contacts to operate said relays, therebeing a greater number of said contacts than'operating circuitswherebysaid switching, mechanism must be selectively operated in'predeterminedsequence to select thegconta'cts connected with said operating circuitsto'properly operate said relays in the necessary sequence to control theclosure or: the desired circuit, a release clrcuit extending fromsaid-switching mechanismdor restoring said relays to normal cond1t1onand electric devices controlled by said alarm circuit for givinganalarm.

I 7. 'A -control system of the type'described comprlslng in combination,an alarm 'ci'rcuit, a plurality of electromagnetic devices,operating-circuits for said devices each controlled b the operation ofapreceding one 'of said evices in the sequence of, operation ofsaid.devices, contacts operated by the last one of said devices in saidsequence of operation for controlling the closure of said alarm circuit,a switchingmechanism havmg aplurality of ofperatlvepositions, one ionoperating each' 0 said devlces and other inoperative positions, wherebysaid devices are operated to control'the closure of said circuit onlywhen said switching mechanism is moved successively tothe severalpositions controlling said devices in their "predetermined sequence ofoperation, a locking circuit for each electromagnetic device formaintaining it in operated condition when actuated and electrlc devicescontrolled by saidalarm circuit for giving an'alarm'.

8; A control system of the type described comprising in combination, analarm circuit, aplurality of rela s each controlling the operatingcircuit 0 another in a predetermined sequence, contacts carried by thelast relay in said sequence for controlling the 'closure'of said alarmcircuit, switching mechanisn fgghaving contacts and operatingcircuits'exiiendingeach from a deslred one of said contacts to operatesaid relays, there being a greater number of said contacts thanoperating circuits whereby said switching .mechanism must be selectlvelyoperated in predetermined sequence toselect the contacts connected withsaid operating circuits to properly operate said relaysvi-n thenecessary sequence to control the closure of the desired circuit, alocking circuit for each relay for maintaining it in operated conditionwhen actuated and electric devices controlled by said alarm circuit [forgiving an ,of said devices, contacts operated by the last. one of saiddevices in said sequence of operation. for controlling the closure ofsaid alarm circuit, a'switchingmechanism .having a plurality ofofperative positions, one for operating each 0 said devices'and otherinoperative positions, whereby said devices circuit only-when. saidswitching" mechanism .is moved successively to the several ,positionscontrolling said devicesin their predetermined sequence of operation, alocking circuit for each el'ectroma etic device for maintaining it inoperate condition when actuated, contacts operated by the lastelectromagnetic device in said sequence when actuated for opening thelocking circuits of. the ,precedin electromagnetic device in saidsequence and electric devices controlled by said alarm'circuit forgiving an alarm,

10. control system of the type described comprising in combination, an'alarm'cir cuit,a plurality'pf relays each controlling theoperatingcircuit of another in a' predeterminedsequence, contactscarried by the last relay in said sequence for controlling the closureofsaid alarm eircuit, switching 0 are operatedto control the closure ofsaid,

circuits-extending each from a desired one of said-contacts to operatesaid relays,- the're' being a greater number of said contacts thanoperating circuits wherebys'a'id switching mechanism must be selectivelyoperated in predetermined. sequence to select the contacts connectedwith said operatin circuitsto properly operate said relays in t enecessary sequence to control the closure of the desired circuit, alocking circuit for each re-' lay for maintaining it in operatedcondition when actuated, contacts operated, by they last relay in saidsequencei'when actuated for opening the locking circuits of the ,pre-

"ceding relays in said sequence and ,electric devices'controlled 'bysaid-alarm circuit for giving an alarm. o v i 11. A control system ofthe ty e described comprising in combination, an a arm circuit,

a first relay, switching mechanism having release relay to one ofthecontacts ofsaidI I a plurality of operative positions and acorrespondmgnuniber of operative contacts, a first operating circuitextending from said relay to one ofsaid contacts, a second relay, 7

comprislng in combination, an alarm circuit,

a second operating circuit, extending from said second relay throughcontacts onsaid first relay to a second one of the operative contacts ofsaiol switching mechanism, 'contacts; operated by said second relay fordetermmlng the closure of said alarm circuit,

idle contacts on said switching mechanism. whereby the operativecontacts must be selected and closed in predetermined sequence tooperate said second relay, a locking circuit for said first relayextending through contacts on said second relay whereby when said secondrelay is operated said locking circuit is opened and electric devicescontrolled by said alarm circuit forgivingan valarm.

12. A control system of the type described comprising in cOmbination,analarm circuit,

a plurality of control relays'arranged for a predetermined sequence ofoperatlon, each of said relays after the first in said sequencehavingits operating circuit extending through contacts on the relaypreceding'it in said sequence, switching mechanism having contacts onefor each relay connected to the corresponding operating circuits of.said re-' lays; contacts, operated by the last control relay in saidsequence for determining the closure of said alarm circuit, idlecontacts on said switching mechanism whereby the .operative contactsmust be selected and closed by said switching mechanism in certain orderto operate said control relays in said predetermined sequence, lockingcircuits dt'or said relays, contacts carried by the last relay in saidsequence for opening the locking circuits of the preceding relays whensaid last .relay is operated and electric devices controlled by saidalarm circuit for giving, an alarm. 1 I i v v 13. A control syst-emmfthe type described comprising in combination, an alarm circuit, aplurality of control relays arranged for a predetermined sequence ofoperation, each of said relays after the first in sald sequence having*its. operating circuit extending through'contacts on the relay precedmgit in said sequence, .switching mechanismhaving contacts one for eachrelay connected to the corresponding operating circuits of'said relays,contacts operated bytlre last control relay in said sequencefordetermining the closure of said alarm circuit, idle contacts on saidswitching mechanls m whereby the operative contacts must 'be selectedand closed by -said switching mechanism in certain order to operate saidcontrol relays-in said predetermined sequence, a release relayforrestoring by its operation said control relays, a release circuitextending from'said an alarm. r

actuated, a release erelay operated by said alarm.

switching mechanism and electric devices controlled by sald alarmcircuitfor' giving 14. A control system of theftype described aplurality of electromagnetic devices,op-'

crating circuits. .forsaid devices each controlled by the operation of aprecedingone of said devices in the sequence of operation of saiddevices, contacts operated by the last one of said devices in saidsequence of operatlon for controlling the'closure of said alarm circuit,a switching'mechanism having a plurahty of operative positions, one for.

operating each of-sa'id devices and other in-- operative positions,vwhereby said devices are operated to control the closure of saidcircuit only when said switching mechanism is moved successively to theseveral positions controlling said devices in their predeterminedsequence of operation, a lockingcircuit for each electromagnetic devicefor maintaining it in operated condition when switching mechanismforopening said lock- 'of said alarm circuit, switching mechanism havingcontacts and operating circuits extending each from a desired one ofsaid contacts to operate said relays, there being. a greater number ofsaid contacts than oper- ',ating circuits whereby said switchingmechanism must be selectively operated in predetermined sequence toselect the contacts .connected with said operating circuits "to properlyoperate said relays in the necessary sequence to control the closure ofthe de-' sired circuit, a locking circuit foreach relayfor'maintainingit 1n-- operated condition when actuated, a release relay operated bysaid switching mechanism for opening said locking circuits and electricdevices controlled by said alarm circuit for giving an.

16, A control system ofthe type described comprising in combination, analarmcircuit, a plurality of relays each controll ng the operating:circuit of another in a predetermined sequence', contactscarried by thelast relay in said sequence for controlling the closure of said alarmcircuit, switching mechanism having contacts and operating circuitsextending veach from a desired one of said contacts to operate saidrelays, there beinga greater number of said-contacts than operatingcircuits whereby said switching mechanism must be selectively operatedin pre- :determined sequence to select the contacts ,mechanism havingcontacts and operating circuits extending each from a desired one ofsaid contacts tooperate said relays, there being a greater number ofsaid contacts than operating circuits whereby said switching mechanismmust be selectively operated in predetermined sequence to select thecontacts connected with said operatingcircuits to properly operate saidrelays in the necessary 'sequence ,to control the closure of the alarmcircuit, a locking circuit for each relay for maintaining it in operatedcondition "when actuated, door contacts in said alarm circuit, and acut-off relay actuated by the operation. of said door contacts forcontrolling by its operation the closure of said alarm circuit.

18. A control system of the type described comprising in combination, analarm circuit, a plurality of relays each controlling the operatingcircuit of another ,in a predetermined sequence, contacts carried by thelast relay in said sequence for controlling the closure ofsaid alarmcircuit. switching mechanism having contacts and operating circuitsextending each from a desired one of said contacts to operate saidrelays, there being a greater number of said contacts than operatingcircuits whereby said switching mechanisinmust be selectively operatedin predetermined sequence to select the contacts connected with saidoperating circuits to properly opcratesaid relays, in the necessarysequence to control the closure of the alarm circuit, a locking circuitfor each relay for maintaining it in operated condition when actuated,door contacts in said alarm circuit,

and a cut-off relay actuated by the operation of said door contacts forcontrolling by its operation the closure of said alarm circuit,

said last operated relay being sluggish .in' opcration whereby thecontrol of thealarm cirsaid cut-ofi' 'relay exercises cuit exercised byit isretained until after said alarm circuit.

19. A control system of the type described comprising in combination, analarm circuit, a control relay, switching mechanism "for operating saidrelay, contacts actuated by said relay for controlling the closure ofsaid alarm c1rcu1t,door contacts 1n said its control over 1 alarmcircuit, a cut-off relay actuated by the operation of said doorcontacts, contacts operated by said cut-ofl' relay for controlling theclosure of said alarm circuit, and a looking circuit for said controlrelay controlled by said cut-01f relay whereby the operation of saidcut-ofi' relay opens said locking circuit, said control relay beingsluggish in operation as compared with said cut-01f relay so that thecontrol of the latter over the alarm circuit is exercised before thecorresponding control of the control relay is relinquished.

20. A control system of the type described comprising in combination, analarm circuit, a plurality. of electromagnetic devices, .operating.circuits for sai devices each controlled by the operation of a precedingone ofsaid devices in the sequencerof operation of said devices,contacts operated by the last one'of said devices in said sequence ofoperation for controlling the closure of an electric circuit, aswitching mechanismha-ving a plurality of operative positions, one foroperating each of said devices and other inoperative posit-ions, wherebysaid devices are operated to control the closure of said circuit. onlywhen said switching mechanism is moved successively to the severalposrtions controlling said devices in their predetermined sequence ofoperation, and safety contact, springs carried by the'housing of saidswitching mechanism, said alarm circuit extending through said safetycontact springs whereby an' attempt to dismantle said switchingmechanism results in operating said alarm circuit. a

" 1. A control system of the type described tacts than operatingcircuits whereby said switching mechanism must be selectively operatedin predetermined sequence to select the contacts connected w1th sa1dopering said safety contact springs and"actuat ating circuits toproperly operate said'relays in the necessary sequence to control theclosure of the 'desired circuit, and safety contact springs carried bythe housing of said switching mechanism, said alarm circui'textendinsprings Where y an attempt to dismantle said switching mechanism resultsin operating said safety contact springs and actuating said alarmcircuit. l

' 22. A control system of the type described comprising in combination,an'alarm circuit,

through said safety contact a control relay, contactsactuated by said ofsaid door, and contacts operated by said cut ofi relay for controllingthe closure of said alarm circuit, said control relay controlling by itsoperation the operation of- 23. In combination, a casing for containingswitching mechanism, said casing having a removable, front plate and aninsulating plate inside of said casing carried by said front plate,spring contacts carried by said insulating plate, an alarm circuitconnected with said contacts and extending toa' point remote from saidcasing, alarm mechanism connected with said circuit at said remotepoint, said contacts belng operated by the wall of said casing whensaidfront plate is inplace to disable said contacts, whereby removingsaid 'front plate causes operation of said, contacts and of said alarmmechanism. 7

24. A control system'of the type described comprising in combination, analarm circuit, door contacts connected withsaid circuit for! causingoperation of said circuit, a control relay for disabling the control ofsaid alarm circuit by said contacts, means for operating said controlrelay, and a cut-oft relay operated by said door contacts for alsodisabling the control of said alarm circuit by said contacts, saidcontrol relay controlling by its operation the operation of said cut-oifrelay.

2-5. A control system of the type described comprising in combination,an alarm circuit, contacts connected with said circuit for causingoperation of said circuit, a control relay for disabling the control ofsaid contacts, means for operatingsaid control re lay, door contacts, acut-0E relay operated by said door cont-acts for also disabling thecontrol of. the first mentioned contacts, and

an operating circuit for said cut-ofl' relay extending through said dOOrcontacts and also through contacts on' said control relay.

tending through 26. A control system of the type described comprising incombination, an alarm circuit,

:contacts connected with said circuit 'for causing operation of saidcircuit, a control relay for disabling the control of said contacts,means for operating said control relay, door contacts, a cut-ofi' relayoperated by said door contacts for also disabling the control ofthe'first mentioned contacts, an. operating circuit for said cut-ofi'relay extending through said door contacts and also through; contacts onsaid control relay, and an operating circuit for said control relayextending through contacts of said cut-oft relay.

27.- A control system of the type described comprising in combination,an alarm circuit, contacts connected with said circuit forcausing-operationof said circuit, a control relay for disabling thecontrol of said contacts, means for operating said control relay, doorcontacts, a cut-off relay operated by said door contacts for alsodisabling the control of the first mentioned contacts, an

operating ClICllitfOI said cut-ofl relay extending through-said doorcontacts and also through contactson said control relay, and a lockingcircuit for'said control relay excontac'ts of said cut-ofi' relay.

28. A control system of the type described comprising in combination, analarm circuit, contacts connected with said circuit for causingoperation of said circuit, a control relay for disabling the control ofsaid contacts, a series of relays arranged in sequence, an operatingcircuit foreach of said series of relays except the first in saidsequence extending through contacts of the preceding relay in saidsequence, an operating circuit for said control relayextending throughcontacts of the last of said serieso'f relays, a locking circuit foreach otsaid series of relays, and a release relay haying contacts insaid locking circuits for, opening the same. 1 y

In witness whereof, I hereunto subscribe my name this 21st day of January .A'. D. 1916. Y 3

THEODORE H. NELSON.

